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Finding the Fourth Proportional to 386.20, 533.22 and 353.32

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Solution

The fourth proportional to 386.20, 533.22 and 353.32 is: 487.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.20 : 533.22 = 353.32 : x
  2. Step 2: Convert to fraction form
    386.20/533.22 = 353.32/x
  3. Step 3: Cross multiply
    386.20x = 533.22 × 353.32
  4. Step 4: Simplify right side
    386.20x = 188,397.29
  5. Step 5: Solve for x
    x = 188,397.29/386.20
  6. Step 6: Final answer
    x = 487.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.